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Set to "Direct" for cooling or "Reverse" for heating.
: According to community insights from Electrical Engineering Technology , you can typically disable or adjust alarms by pressing and holding the AL. 1 SET or AL. 2 buttons for approximately 2 seconds. yamatake sdc20 user manual
SDC20/21, SDC30/31用取扱説明書 | PDF | Filename - Scribd Set to "Direct" for cooling or "Reverse" for heating